Performance Characteristic Analysis And Experimental Study Of Moderate-Buried Ground-source Heat Pump System

The Ground Source Heat Pump system is widely used in construction, especially in Beijing which is a water-poor area and the application rate of 35%, due to its resource high security and stability in the residential, commercial, etc. However, the lacking of actual project operating characteristics of the underlying data, resulted in engineering design methods are still modeled on the foreign technology, The Ground Source Heat Pump system is not suitable for hydro-geological conditions, economic conditions, building envelope conditions, such as a mature design. In addition, the experimental study engineering practice most for a single holing , buried pipes, It is not considered the feasibility of long-term efficient operation and the complexity of the structural condition of formation and other factors. In this thesis, it is done the following:First, discusses the research background and significance, and research status at home and abroad and the issues, the overview of the main research content is introduced in the underground heat pump system, the definition of its components.Second, On the VC.Mei heat transfer model, based on the depth of soil in different geological structures under its different, with the attendant rise to its thermal properties are changed, the model considers the soil layer along the depth direction for the problem to establish a two-dimensional radial and axial partial differential equations, solution by the soil layer when the temperature distribution of the theoretical solution, so as to provide the basis for the design of underground pipe.Third, the typical office building of the Office of Hebei Province Project, from the basic composition and arrangement of several measuring points in detail and a systematic introduction to the underground heat pump system, the experimental monitoring platform, developed using MATLAB to calculate vertical ground heat exchanger thermal properties of soil around the software.Fourth, the use of buildings through the construction of the Office of the characteristics of the annual variation of air conditioning load balance problem with the cooling and heating loads, in combination with the measured approach to investigate the laws described in accordance with Chapter III of the experimental platform to build, focusing on analysis the underground heat exchanger in the flow, the thermal conductivity of soil, initial soil temperature, ground temperature and other factors out of the water on the ground heat transfer effects, and also analyzes the characteristics of the ground source heat pump units.